Create a Uniform Static Magnetic Field Over 50 T in a Large Free Space Region

Sun, Fei; He, Sailing

doi:10.2528/pier13012802

Cited by 10 publications

(20 citation statements)

References 32 publications

(41 reference statements)

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“…As the behavior of the static magnetic field is still governed by Maxwell's equations, we can use TO to determine the transformed materials according to the above transformation [13]:…”

Section: Discussionmentioning

confidence: 99%

“…However, it still needs some anisotropic medium whose permeability is zero in one principle direction and infinite in the other principle direction. Based on the space folded transformation, we have designed a passive compact concentrator that can achieve an extremely high static magnetic field enhancement in a large free space region with high field uniformity, which may have potential applications in MRI [13]. However, some special materials with a negative DC permeability, which is still a topic under study, are needed for the realization.…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, some DC magnetic lenses/concentrators have been designed based on transformation optics (TO) [12][13][14]. TO is a powerful theoretical tool that can be used to control the trace of electromagnetic waves and also the static electric or magnetic field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

Sun¹,

He²

2013

PIER

Self Cite

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Abstract-A novel concentrator for static magnetic field enhancement is proposed and designed utilizing transformation optics. Compared with other devices for static magnetic field enhancement, our device has many good features: first, our concentrator can achieve a DC magnetic field enhancement in a relatively large free space with high uniformity. Secondly, our concentrator is composed by only one or two homogenous anisotropic materials with principal value greater than zero (without any infinitely large or zero value), which can be achieved by using currently available materials. Thirdly, the geometrical shape of the proposed device determines the enhancement factor and the permeability of the device. After choosing suitable geometrical parameters, we can obtain a concentration with a suitable enhancement factor and a material requirement that is easily achievable. The proposed concentrator will have many important applications in many areas (e.g., magnetic resonance imaging and magnetic sensors). Based on the same theoretical model, we also proposed a cascaded shielding device cloak for static magnetic fields. The proposed DC magnetic shielding device can be realized without using any material of zero permeability, and will have potential applications in, e.g., hiding a metallic object from being detected by a metal locator.

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“…As the behavior of the static magnetic field is still governed by Maxwell's equations, we can use TO to determine the transformed materials according to the above transformation [13]:…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

Sun¹,

He²

2013

PIER

Self Cite

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show abstract

“…In recent years, many novel devices for DC magnetic fields have been designed or even verified experimentally, including cloaking for DC magnetic fields [9,10], DC magnetic concentrators [11][12][13][14], DC magnetic lenses [15] and DC magnetic hoses [16] by using a new theory called transformation optics (TO) [17,18]. These novel DC magnetic devices can perform excellently in some special applications.…”

Section: Introductionmentioning

confidence: 99%

“…These novel DC magnetic devices can perform excellently in some special applications. For example, DC magnetic concentrators based on TO can provide an enhanced DC magnetic field with high uniformity in a large free space region [11][12][13][14], which may be used to improve the imaging quality in MRI. Many of these (superconductor-based or mostly TO-based) magnetic lenses are closed structures, which mean they can only provide a good magnetic field enhancement in the free space region inside the lenses.…”

Section: Introductionmentioning

confidence: 99%

Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Sun¹,

He²

2014

PIER

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Abstract-The idea of transformation inside a null-space region is introduced for the first time, and used to design a novel DC magnetic compressor that concentrates DC magnetic flux greatly and behaves as a DC magnetic funnel. The proposed device can be used as a passive DC magnetic lens to achieve an enhanced DC magnetic field (e.g., 7.9 times or more depending on the size and other parameters of the compressor) with a large gradient (e.g., 450 T/m or more) in free space. After some theoretical approximation, the proposed device can be easily constructed by using a combination of superconductors and ferromagnetic materials. Numerical simulations are given to verify the performance of our device. The proposed method (use a null-space region as the reference space) can be extended to reduce the material requirement when designing other devices with transformation optics.

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Transformation magneto-statics and illusions for magnets

Sun

2014

Sci Rep

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Based on the form-invariant of Maxwell's equations under coordinate transformations, we extend the theory of transformation optics to transformation magneto-statics, which can design magnets through coordinate transformations. Some novel DC magnetic field illusions created by magnets (e.g. rescaling magnets, cancelling magnets and overlapping magnets) are designed and verified by numerical simulations. Our research will open a new door to designing magnets and controlling DC magnetic fields.

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Create a Uniform Static Magnetic Field Over 50 T in a Large Free Space Region

Cited by 10 publications

References 32 publications

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Transformation magneto-statics and illusions for magnets

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